# Child cortisol and stress works differently than in adults
When we imagine stress, most of us picture an overwhelmed adult – piles of work, sleepless nights, endless to-do lists. But stress knows no age limit. Children experience it just as intensely, perhaps even more so, and yet few people can recognise it in time. The reason is simple: childhood stress looks completely different from adult stress, and if we don't know what to look for, we easily overlook it or misinterpret it.
The key to understanding the whole picture is a hormone called cortisol. It's known as the "stress hormone", but its role in the body is far more complex – and in children, it operates somewhat by its own rules.
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What is cortisol and why does it matter
Cortisol is a steroid hormone produced by the adrenal glands. Its primary role is to help the body cope with stressful situations – it mobilises energy, increases alertness, suppresses inflammation and prepares the body for a "fight or flight" response. In small doses and at the right time, cortisol is absolutely essential. Problems arise when its levels remain elevated over the long term.
In adults, chronically high cortisol manifests in fairly typical ways: fatigue, irritability, sleep problems, weight gain or reduced immunity. An adult's brain also has a well-developed prefrontal cortex, which helps regulate emotions and stress responses. Children don't have this advantage. Their brains are still developing, the prefrontal cortex doesn't fully mature until around the age of twenty-five, and so their stress responses are far less controlled and far more physical.
Research shows that cortisol levels in children respond to stressors differently than in adults – sometimes more sharply, sometimes more suppressed, depending on the child's age, temperament and, crucially, how safe an environment they have around them. According to a review published in the academic journal Psychoneuroendocrinology, the quality of the relationship with the caregiver – known as attachment – plays a key role in regulating cortisol in children.
What stress looks like in a child – and why we so easily miss it
An adult under pressure can usually name what they're feeling. They say "I'm stressed", "I can't keep up", "I need a break". A child doesn't have this ability. They lack the vocabulary for inner states, they lack the experience of identifying stress, and furthermore – and this is crucial – their nervous system literally overwhelms them before they have a chance to analyse anything.
The result is that childhood stress manifests as behaviour that, at first glance, has nothing to do with stress. Parents and teachers then respond to the symptoms without realising what lies behind them.
Let's take a concrete example. Seven-year-old Marek began refusing food every morning after starting first grade, developed stomach aches, and couldn't fall asleep in the evenings without a parent present. To those around him, his behaviour looked like spoiltness or somatisation without cause. In reality, his body was responding to an enormous change in environment – new relationships, new demands, new rules. Cortisol was doing exactly what it's supposed to: preparing him for "danger". But the brain of a seven-year-old cannot distinguish between a genuine threat and social pressure at school.
This is precisely where the greatest difference from adults lies. While an adult usually knows when a situation is dangerous and when it isn't, a child is still learning this distinction. Their amygdala – the part of the brain responsible for processing fear – responds to social stressors (rejection by a friend, parents arguing, a teacher's stern tone) just as intensely as to physical threat.
Among the most common manifestations of stress in children that are frequently misinterpreted are recurring stomach aches or headaches without any apparent medical cause, regression to developmentally younger behaviour (bedwetting, thumb-sucking in children who had long since stopped), outbursts of anger or, conversely, noticeable withdrawal, sleep disturbances, food refusal or overeating, and loss of interest in things the child previously enjoyed.
This list is not exhaustive, but it shows how many different masks childhood stress can wear. Paediatric psychologist Mona Delahooke warns in her book Beyond Behaviors: "A child's behaviour is not a problem to be fixed – it is a message to be read."
Toxic stress and the developing brain
Not all stress is harmful. Experts distinguish between so-called positive stress (short, manageable pressure that builds resilience), tolerable stress (more serious events, but with the support of a caregiver) and toxic stress. The last of these is the one to be most concerned about.
Toxic stress arises when a child is exposed to intense or prolonged pressure without adequate adult support. This can include domestic violence, poverty, neglect, loss of a loved one, but also less obvious chronic stressors – such as a persistently tense atmosphere at home, excessive performance expectations or peer bullying.
With toxic stress, cortisol levels remain chronically elevated, and this has a direct impact on the developing brain. Research from the Center on the Developing Child at Harvard University shows that chronically elevated cortisol in early childhood literally changes the architecture of the brain – disrupting the development of areas responsible for learning, memory and emotional regulation. In other words, long-term stress in childhood is not merely an unpleasant experience. It is an intervention in biological development, the consequences of which can manifest well into adulthood.
This is one of the reasons there has been so much discussion in recent years about so-called ACEs – Adverse Childhood Experiences. A large-scale study, the results of which are available on the CDC website, demonstrated that the more adverse experiences a child has, the higher their risk of health and psychosocial difficulties in adulthood – ranging from cardiovascular disease and depression to addiction.
How to help a child regulate cortisol naturally
The good news is that the brain is plastic – especially in childhood. And the key factor capable of dampening the negative effects of stress is a secure relationship with a caregiver. This is not a cliché; it is neurobiology. When a child feels seen, heard and accepted, their nervous system calms down. Cortisol drops. The brain can focus on learning and development rather than survival.
In practice, this means things that seem simple but have a profound impact. Predictability and routine serve as an anchor for a child – knowing what's coming reduces uncertainty and, with it, the stress response. Physical contact, such as hugs or shared calm activities, stimulates the production of oxytocin, which naturally suppresses cortisol. Outdoor movement, particularly in nature, has proven effects on reducing stress hormones – research from Stanford University showed that time spent in natural environments reduces activity in brain regions associated with rumination and anxiety.
Diet also matters. Chronic stress and high cortisol increase the body's need for magnesium, B vitamins and omega-3 fatty acids. These are not miracle supplements, but fundamentals – a varied, minimally processed diet rich in vegetables, wholegrains and healthy fats is a foundational building block of stress resilience in both children and adults.
Sleep is equally important. In children, the natural reduction of cortisol occurs during the night-time hours, and if sleep is disrupted or insufficient, the entire system is thrown off balance. Yet stress itself is one of the most common causes of poor sleep in children – creating a vicious cycle that must be broken from the outside, through establishing a calm bedtime routine and limiting stimulation before sleep.
Parents sometimes underestimate the power of their own calm. A child's nervous system attunes itself to the nervous system of the caregiver – a process known as co-regulation. A child whose parent is themselves chronically stressed is in a far more difficult position, because they have nowhere to draw calming signals from. This doesn't mean parents need to be perfect. It means that caring for one's own stress is simultaneously caring for the child.
Recognising how differently cortisol functions in children, and how subtly stress can manifest in childhood, is the first step towards truly helping. The goal is not to stop placing demands on children or to protect them from every difficulty – a healthy level of challenge is essential for building resilience. The goal is to be present, to notice the signals, and to understand that mysterious stomach aches or an outburst of anger before school are not "naughtiness". They are messages. And every message deserves to be read.
